Grain Refinement of Al Cast by Novel Al-Al_2.5Cu_0.5Ti Refiner Fabricated by Cold Pressing

Abstract:

It is reported that alloying with Cu causes the transformation from the D0₂₂ type structure of Al₃Ti into L1₂ cubic structure. Since the lattice constant of Al_2.5Cu_0.5Ti with L1₂ structure is a = 0.3927 nm, smaller disregistry value between Al and Al_2.5Cu_0.5Ti can be achieved. In this study, novel refiner for Al cast containing Al_2.5Cu_0.5Ti intermetallic compound particles with L1₂ structure is fabricated by cold pressing. It is found that the grains of Al cast are partially refined by using the novel refiner, although microstructure of Al grain is not homogeneous. In this way, the Al_2.5Cu_0.5Ti intermetallic compound particles with L1₂ structure can become favorable heterogeneous nucleation sites for Al cast.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 276-281
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.276
• Online since: May 2014
• Authors: Kunika Yamanaka, Hisashi Sato, Yoshimi Watanabe*
• Keywords: Al_2.5Cu_0.5Ti, Cast Al, Cold Pressing, Disregistry, Heterogeneous Nucleation, Intermetallic Compound, L1₂ Structure, Refiner, Solidification

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